!<space>= should give error?

Hi,

with below query I am getting unexpected output. here !<space>= is behaving
as =
is this expected behaviour?

postgres=# create table tbl (col_a int, col_b int);
CREATE TABLE
postgres=# insert into tbl values (1,2);
INSERT 0 1
postgres=# insert into tbl values (2,1);
INSERT 0 1

*postgres=# select * from tbl where col_a ! = 1; col_a |
col_b-------+------- 1 | 2(1 row)*

postgres=# select * from tbl where col_a = 1;
col_a | col_b
-------+-------
1 | 2
(1 row)

Thanks & Regards,
Rajkumar Raghuwanshi
QMG, EnterpriseDB Corporation